Issue Summary

The Confluence Cloud mobile app for Android (v5.9.27.3) fails to register any notification channels with the Android OS on Android 16 (API 36). This results in zero push notifications being delivered. The only notification channel visible in Android Settings is "Unused," indicating the app has failed to initialize its FCM (Firebase Cloud Messaging) notification channels via NotificationManager.createNotificationChannel().

Steps to Reproduce

1. Install Confluence Cloud app (com.atlassian.android.confluence.core) v5.9.27.3 from Google Play Store on a Pixel 8 Pro running Android 16 (CP1A.260305.018).
2. Sign in to a Confluence Cloud instance.
3. Open the app → Profile → Notification Settings → enable "All activity" (also tested with individual activity types toggled on, and "All" selected).
4. Open Android Settings → Apps → Confluence → Notifications.
5. Observe that the only notification channel listed is "Unused" - no app-defined channels (e.g., "Mentions," "Page Updates," "Comments") are registered.
6. Trigger a notification event from another user (e.g., @mention on a page, comment on a watched page).
7. No push notification is delivered to the device.

Expected Results

The app should register named notification channels (e.g., "Mentions," "Comments") upon sign-in, allowing Android to route push notifications to the tray.

Actual Results

Zero channels are registered. In-app notification feed (bell icon) works, confirming the server-side pipeline is healthy, but the client-side delivery to the Android notification shade is broken due to missing channels.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available